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Finding the Fourth Proportional to 487.18, 672.28 and 290.69

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Solution

The fourth proportional to 487.18, 672.28 and 290.69 is: 401.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.18 : 672.28 = 290.69 : x
  2. Step 2: Convert to fraction form
    487.18/672.28 = 290.69/x
  3. Step 3: Cross multiply
    487.18x = 672.28 × 290.69
  4. Step 4: Simplify right side
    487.18x = 195,425.07
  5. Step 5: Solve for x
    x = 195,425.07/487.18
  6. Step 6: Final answer
    x = 401.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.